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Fix double-counting bug in promhttp.InstrumentRoundTripperCounter (#1118) 

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

Signed-off-by: Dave Henderson <dhenderson@gmail.com>
This commit is contained in:
Dave Henderson 2022-08-22 01:28:46 -04:00 committed by GitHub
parent c7aa2a5b84
commit f73e3cc0e2
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 14 additions and 1 deletions
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1
prometheus/promhttp/instrument_client.go
View File

@ -78,7 +78,6 @@ func InstrumentRoundTripperCounter(counter *prometheus.CounterVec, next http.Rou
1,
rtOpts.getExemplarFn(r.Context()),
)
counter.With(labels(code, method, r.Method, resp.StatusCode, rtOpts.extraMethods...)).Inc()
}
return resp, err
}

14
prometheus/promhttp/instrument_client_test.go
View File

@ -25,6 +25,7 @@ import (
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/testutil"
dto "github.com/prometheus/client_model/go"
"google.golang.org/protobuf/proto"
@ -250,6 +251,19 @@ func TestClientMiddlewareAPI_WithRequestContext(t *testing.T) {
t.Errorf("metric family %s must not be empty", mf.GetName())
}
}
// make sure counters aren't double-incremented (see #1117)
expected := `
# HELP client_api_requests_total A counter for requests from the wrapped client.
# TYPE client_api_requests_total counter
client_api_requests_total{code="200",method="get"} 1
`
if err := testutil.GatherAndCompare(reg, strings.NewReader(expected),
"client_api_requests_total",
); err != nil {
t.Fatal(err)
}
}
func TestClientMiddlewareAPIWithRequestContextTimeout(t *testing.T) {